From 588822fcb313ddc569576c36d2c950538d232a9b Mon Sep 17 00:00:00 2001 From: "K.T.VIJAYAKUMAAR" Date: Mon, 3 Sep 2018 20:07:44 +0300 Subject: [PATCH] ath10k: avoid possible memory access violation [ Upstream commit 97c69a70dc2cecb2c3b96a66529e0082dabc2d2c ] array "ctl_power_table" access index "pream" is initialized with -1 and is raised as a static analysis tool issue. [drivers\net\wireless\ath\ath10k\wmi.c:4719] -> [drivers\net\wireless\ath\ath10k\wmi.c:4730]: (error) Array index -1 is out of bounds. Since the "pream" index for accessing ctl_power_table array is initialized with -1, there is a chance of memory access violation for the cases below. 1) wmi_pdev_tpc_final_table_event change frequency is between 2483 and 5180 2) pream_idx is out of the enumeration ranges of wmi_tpc_pream_2ghz, wmi_tpc_pream_5ghz Signed-off-by: K.T.VIJAYAKUMAAR [kvalo@codeaurora.org: clean up the warning message] Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/ath10k/wmi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c index 9f31b9a..583147f 100644 --- a/drivers/net/wireless/ath/ath10k/wmi.c +++ b/drivers/net/wireless/ath/ath10k/wmi.c @@ -4785,6 +4785,13 @@ ath10k_wmi_tpc_final_get_rate(struct ath10k *ar, } } + if (pream == -1) { + ath10k_warn(ar, "unknown wmi tpc final index and frequency: %u, %u\n", + pream_idx, __le32_to_cpu(ev->chan_freq)); + tpc = 0; + goto out; + } + if (pream == 4) tpc = min_t(u8, ev->rates_array[rate_idx], ev->max_reg_allow_pow[ch]); -- 2.7.4